Lid for a mug or tumbler



FIG. 1 is a perspective view from the top and one side of our lid for a mug or tumbler design;

FIG. 2 is a front elevation view of our lid for a mug or tumbler design;

FIG. 3 is a rear elevation view of our lid for a mug or tumbler design;

FIG. 4 is a side elevation view of our lid for a mug or tumbler design taken from left of FIG. 2;

FIG. 5 is a side elevation view of our lid for a mug or tumbler design taken from right of FIG. 2; and,

FIG. 6 is a top plan view of our lid for a mug or tumbler design.

It is to be understood that parts shown in dotted lines form no part of our inventive lid for a mug or tumbler design. 

The ornamental design for a lid for a mug or tumbler, as shown and described. 